dm: key: Use half range mechanism for adc keys

Following the upstream adc-button.c file.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I0b59eff483310601adfac9724fb4ac43307cafb3

dm: key: refactor code

- use standard dm framework to implement all key drivers;
- all key node to be children and attach to key bus;
- dm key uclass takes over most work;
- reduce a lot of driver c

dm: key: refactor code

- use standard dm framework to implement all key drivers;
- all key node to be children and attach to key bus;
- dm key uclass takes over most work;
- reduce a lot of driver code size;

Change-Id: I9ea4515249d493eb4434890b90350f694c07404f
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

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input: rk key: fix missing register key into dm input uclass

Change-Id: I3237923ed14724e838a8b79a40db4ac45dde5f16
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

dm: key: optimise framework and update drivers

1. dm key framework takes over more generic jobs;
2. key drivers remove unused codes and match new framework;
3. only power key is registered as interr

dm: key: optimise framework and update drivers

1. dm key framework takes over more generic jobs;
2. key drivers remove unused codes and match new framework;
3. only power key is registered as interrupt key;

Change-Id: Icdda86f588af721b685f801ed251581f2fd85793
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

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input: rk key: fix compile warning

Change-Id: I357db633bbd904d00757a909665f8f624ef2b50d
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

input: rk_key: use dm universal interface to parse event

Change-Id: I80c7a75a4150f1a8ebbf3d70541aa737cd687f91
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

input: key: add rk key driver

rk key device node can contain adc key and gpio key.

Change-Id: I6e3bd4022bba6324c35d2c317183a6a2cb69ed06
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>